Munchkin? I got the Deluxe set which adds a board to the cards. There are a million expansion packs but I am trying to learn the original game.

(The game is a pisstake of role playing games; 'Munkin' is a term for a newbie who only wants to amass power and riches regardless of the story in the game, so this game really only has those elements, with a crazy twisted humour. For eg, you can play cars like The Kneepads Of Allure, lol).

I also got card versions of Monopoly and Clue, which reduce the games down to a deck of cards; a game can take as little as 25 mins.